pingcap
sink(ticdc): adjust lag bucket and add metrics for sink flush lag (#10596)
This is an automated cherry-pick of #10596
What problem does this PR solve?
Issue Number: close #10675
What is changed and how it works?
Adjust the lag bucket of related metrics like ticdc_owner_checkpoint_lag_histogram.
Add a new metric ticdc_sink_flush_lag_histogram to monitor the per event flush lag calculated by ts_after_event_flushed_to_downstream - commit_ts_of_event
Check List
Tests
- Unit test
- Integration test
- Manual test (add detailed scripts or steps below)
- No code
Questions
Will it cause performance regression or break compatibility?
Do you need to update user documentation, design documentation or monitoring documentation?
Release note
None
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This pull-request has been approved by: asddongmen
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